Zuzana Vidholdova

Zuzana Vidholdova
Technical University in Zvolen · Department of Wood Technology (KDT)

PhD.

About

40
Publications
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225
Citations

Publications

Publications (40)
Article
Full-text available
Fungi play a critical role in the decomposition of wood and wood-based products in use. The ability of decaying fungi to cause degradation of polysaccharides and lignin in the thermally modified Norway spruce (Picea abies L. Karst.) wood was examined with pure culture decomposition tests in laboratory conditions using the brown-rot fungus Serpula l...
Article
Full-text available
This article presents a proposal of thermal modification of Norway spruce and sycamore maple for special wood products, mainly for musical instruments. Selected physical and acoustical characteristics (PACHs), including the density (ρ), dynamic modulus of elasticity along the wood grain (EL), specific modulus (Esp), speed of sound along the wood gr...
Article
Full-text available
In Central Europe, European beech (Fagus sylvatica L.) wood has a high potential for the production of construction and decorative materials, with the aim of replacing Norway spruce, oaks, and other traditionally used tree species. However, the biological resistance of beech wood—to decaying fungi, molds, and insects—is low, and in damp conditions...
Article
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Worldwide production of wooden pallets continually increases, and therefore in future higher number of damaged pallets need to be recycled. One way to conveniently recycle pallets is their use for the production of particleboards (PBs). The 3-layer PBs, bonded with urea-formaldehyde (UF) resin, were prepared in laboratory conditions using particles...
Article
Full-text available
In recent years, the production and consumption of thermally modified wood (TMW) has been increasing. Offcuts and other waste generated during TMWs processing into products, as well as already disposed products based on TMWs can be an input recycled raw material for production of particleboards (PBs). In a laboratory, 16 mm thick 3-layer PBs bonded...
Article
Full-text available
This paper deals with the influence of the type of transparent surface finish on the change of colour of the surfaces of native wood, and thermally treated wood, with saturated water vapour. In the experiment, alder, European beech, Paper birch, and Norway maple wood were thermally treated at a temperature of 135 °C under saturated water vapour for...
Article
Full-text available
In the wood industry, laser technologies are commonly applied for the sawing, engraving, or perforation of solid wood and wood composites, but less knowledge exists about their effect on the joining and painting of wood materials with synthetic polymer adhesives and coatings. In this work, a CO2 laser with irradiation doses from 2.1 to 18.8 J·cm−2...
Article
Full-text available
In this study, natural linseed oil, hard wax oil, and hard wax, commonly used as finishes for wooden furniture and parquet, were used for surface finishes on Turkey oak wood (Quercus cerris L.), thermally modified at temperatures of 175 °C and 195 °C for 4 h. Several resistance surface properties were investigated. The mechanical resistance propert...
Article
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The quality of the bonded joints in wood structures and furniture products is influenced by the surface characteristics of wood and the physical-chemical characteristics of adhesive. In this study the polyurethane (PUR) and polyvinyl acetate (PVAc) adhesives were used for bonding the Norway spruce (Picea abies /L./ Karst.) wood which was firstly dr...
Article
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The effective recovery of wood waste generated in wood processing and also at the end of wood product life is important from environmental and economic points of view. In a laboratory, 16 mm-thick three-layer urea–formaldehyde (UF)-bonded particleboards (PBs) were produced at 5.8 MPa and 240 °C and with an 8 s/mm pressing factor, using wood particl...
Article
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The biological resistance of 21 tropical wood species against bacteria and molds was studied. The gram-positive bacterium Staphylococcus aureus and the gram-negative bacterium Escherichia coli had none or negligible activity on surfaces of zebrano and maçaranduba (up to 1 ×10 6 CFU/mL), and they had negligible or medium activity on surfaces of maca...
Article
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Compressive resistance of the mycelium composite. Mycelium composites are a type of novel, economical and environmentally sustainable materials. The advantage of this material is that it forms a compact unit without the use of any adhesives. In this study mycelium boards were prepared from middle wood chipped particles for the manufacturing of comm...
Article
Full-text available
Fourier-transform near-infrared spectroscopy (FT-NIR) was used as none-destructive method to determinate changes in the chemical structure of heat-treated wood. For this purpose, pine sapwood (Pinus sylvestris L.) was treated at different temperatures (from 100 °C to 240 °C) and for three durations (1, 3 or 5 hours). The effects of chemical changes...
Article
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Interesting aesthetic properties of tropical woods, like surface texture and colour, are rarely impaired due to weathering, rotting and other degradation processes. This study analyses the colour of 21 tropical woods before and after six weeks of intentional attack by the brown-rot fungus Coniophora puteana. The CIEL*a*b* colour system was applied...
Article
Full-text available
Effects of biological modification of Norway spruce wood with the wood-staining fungus Sydowia polyspora were evaluated relative to select physical and acoustical characteristics (PACHs), including the density (ρ), dynamic modulus of elasticity along the wood grain (EL), specific modulus (Esp), speed of sound along the wood grain (cL), resonant fre...
Article
Full-text available
Special particleboards (PBs) proposed for kitchens, bathrooms, hospitals, and some other specific products for interiors should have a sufficient resistance against bacteria, molds, and decaying fungi. This work deals about effects of zinc oxide nanoparticles (nano-ZnO) added into melamine-urea-formaldehyde (MUF) glue in the amounts of 0, 2, 6, 12,...
Article
Full-text available
Treatment of wood surfaces with various finish coating materials is recommended for long term protection of wood products exposed outdoor. Due to natural weathering, the colour and the surface roughness of uncoated wood is changed. However, in practice it can happen that wood in constructions has been weathered prior to application of a finish. In...
Article
Full-text available
Molds in wet and warm environments often attack surfaces of products made from beech and other less or moderately durable woods. This paper presents the effects of the physical modification of beech wood with a CO2 laser having a constant power output of 45 W, using eight radiation doses from 7.8 to 75 J/cmcm². Variations in laser activations creat...
Article
Full-text available
The paper deals about an anti-mould efficiency of nano-zinc oxide applied into wood alone (0.1%, 0.33%, 1% and 3% ZnO) or in combination with polyacrylate (5% Paraloid B-72) and essential oils (1% and 3% clove, oregano or thyme oil). Treatment of lime tree and maple samples 50×10×5 mm (L×R×T) with these chemicals was performed by one-step or two-st...
Article
Full-text available
Protection of particleboards (PBs) with inorganic water soluble biocides (e.g. copper salts) can be recommended for indoor occasionally moistened expositions – i.e. at a random effect of condensate water or at a water leaking from damaged pipeline – lasting a short time without damage of the adhesion connections between wooden particles and glue. T...
Article
Full-text available
The paper evaluates the colour changes after weathering in the exterior of pinewood. It also monitors the influence of two examined factors on the colour change of surface; the two factors being: the length of exposure in the exterior and parts of wood – sapwood, heartwood. The submitted article deals with colour changes occurring on the sapwood an...
Article
Full-text available
This work investigates the anti-decay efficiency of nano-zinc oxide (ZnO-Nano: 0.1, 0.33, 1 or 3% ethanol dispersions), three essential oils (clove, oregano and thyme: 1 or 3% ethanol solutions), as well as their mixtures – introduced into samples 25 × 25 × 3 mm (L × R × T) of maple wood (Acer pseudoplatanus) by dipping at 20°C/1hour. The anti-deca...
Article
Full-text available
The paper evaluates the colour changes after weathering in the exterior of pinewood. It also monitors the influence of two examined factors on the colour change of surface; the two factors being: the length of exposure in the exterior and parts of wood – sapwood, heartwood. The submitted article deals with colour changes occurring on the sapwood an...
Article
Full-text available
Bacteria and mould exposures are reported to be associated with allergies, respiratory symptoms and asthma. Wood products with antimicrobial surface would reduce the risk of spreading microbial infections especially in healthcare facilities and public buildings. In future is perspective of their use.In this study, twenty five wooden composites comm...
Article
he paper deals with the evaluation of photostability of six selected transparent surface coatings applied on veneered furniture parts. It also estimates the influence factors such as exposure to natural sunlight in the interior, the length of exposure, wood species of used veneers and type of transparent coatings. The changing colour of surface tre...
Article
Full-text available
Wooden artefacts have to be in some situations conserved with the aim to restore their aesthetical, strength and durability properties. Various types of conservation agents can be used for these purposes. In this work, there is searched individual and combined anti-fungal effect of the oxide nanoparticles (0.1 %, 0.33 % and 1 % ZnO-Nano) and the et...
Article
Full-text available
Wooden artefacts have to be in some situations conserved with the aim to restore their aesthetical, strength and durability properties. Various types of conservation agents can be used for these purposes. In this work, there is searched individual and combined anti-fungal effect of the oxide nanoparticles (0.1 %, 0.33 % and 1 % ZnO-Nano) and the et...
Conference Paper
Full-text available
In our work, we were interested in the differences of durability sessile oak (Q.petraea) wood. So, specimens were made of outer sapwood, heartwood further from the pith, internal sapwood and heartwood nearer to the pith. Subsequently, specimens were exposed to brown rot fungus Daedalea quercina (L.) Fr. according to the standard STN EN 113 for 2, 4...
Article
Full-text available
The sound wood samples {Aesculus hippocastanum) without treatment were attacked by the wood decay fungus Fomes fomentarius under laboratory conditions over the period of 15 and 60 days. Both macroscopic and microscopic analyses have shown that wood specimens are easily attacked with fungus mycelium. Surface and substrate mycelium have been growing...
Book
Full-text available
Thermowood is comparatively new type of wooden material which has been manufactured for more than 10 years in Finland, the Netherlamds, France and other EU member countries of the world in amount of 200 000 m3 / year. The aim of monohraph is to offer to Slovak and Czech specialists in area of woodwoorking and building industry, students as well as...
Conference Paper
Full-text available
Resistance of wood against decay, mould, and other types of biological damaging can be increased either with biocides, or by modification of its structure. Today various thermally treated thermowoods (ThermoWood, PlatoWood, OHT-wood, New-option-wood, etc.) with improved durability are applied for internal and also for external usage. The aim of thi...
Article
This paper deals with pre-treatment of spruce wood with bacteria Bacillus subtilis and microscopic fungi Trichoderma viride with the aim to increase its permeability and to study its resistance against wood-destroying fungi Serpula lacrymans, Coniophora puteana and Trametes versicolor. Mycological test was performed according to the standard STN EN...
Conference Paper
Full-text available
Beech wood (Fagus sylvatica) with a moisture content of about 10 % or 60 % was thermally treated at a temperature of 175 °C or 205 °C during 3 hours or their combinations during 6 hours. The wood samples were subsequently attacked by the brown-rot fungus Gloeophyllum trabeum under laboratory conditions during 16 weeks. Microscopic analyses of fungu...
Conference Paper
Full-text available
Beech wood (Fagus sylvatica) was modified with the pure polyacrylate Paraloid B-72 (copolymer of methylacrylate and ethylmetacrylate) or with various combinations of this polyacrylate and the TCMTB fungicide (2-tiocyanomethylthiobenztiazol). The wood samples were subsequently attacked by brown-rot fungi (Coniophora puteana and Gloeophyllum trabeum...
Conference Paper
Full-text available
Natural durability of wood species is variable. Chemical wood preservatives, such as biocides are necessary for extension of their service life. Many methods have been developed to increase the resistance of wood and wood products against wood-destroying organisms during the last years. The most frequently used methods are chemical and thermal modi...
Article
Rot of wood is usually caused by more fungi among which antagonistic, synergetic or indefinite relations may occur. In the presented paper a decay activity of three brown-rot fungi Serpula lacrymans, Coniophora puteana and Gloeophyllum trabeum was tested with the aim to compare their activity on the sound and the rotten wood specimens primary degra...

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